Implment the last part of P1024: tuple-like interface to span. Reviewed as https://reviews.llvm.org/D58706.
llvm-svn: 354988
diff --git a/libcxx/test/std/containers/views/span.tuple/get.pass.cpp b/libcxx/test/std/containers/views/span.tuple/get.pass.cpp
new file mode 100644
index 0000000..4c8c85e
--- /dev/null
+++ b/libcxx/test/std/containers/views/span.tuple/get.pass.cpp
@@ -0,0 +1,75 @@
+// -*- C++ -*-
+//===------------------------------ span ---------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===---------------------------------------------------------------------===//
+// UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
+
+// <span>
+
+// template <size_t _Ip, ElementType, size_t Extent>
+// constexpr ElementType& get(span<ElementType, Extent> s) noexcept;
+//
+
+
+#include <span>
+#include <cassert>
+#include <string>
+
+#include "test_macros.h"
+
+
+template <size_t Idx, typename Span>
+constexpr bool testConstexprSpan(Span sp, typename Span::pointer ptr)
+{
+ ASSERT_NOEXCEPT(std::get<Idx>(sp));
+ return std::addressof(std::get<Idx>(sp)) == ptr;
+}
+
+
+template <size_t Idx, typename Span>
+void testRuntimeSpan(Span sp, typename Span::pointer ptr)
+{
+ ASSERT_NOEXCEPT(std::get<Idx>(sp));
+ assert(std::addressof(std::get<Idx>(sp)) == ptr);
+}
+
+struct A{};
+constexpr int iArr1[] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
+ int iArr2[] = {10, 11, 12, 13, 14, 15, 16, 17, 18, 19};
+
+int main(int, char**)
+{
+
+// static size
+ static_assert(testConstexprSpan<0>(std::span<const int, 4>(iArr1, 1), iArr1 + 0), "");
+ static_assert(testConstexprSpan<1>(std::span<const int, 4>(iArr1, 2), iArr1 + 1), "");
+ static_assert(testConstexprSpan<2>(std::span<const int, 4>(iArr1, 3), iArr1 + 2), "");
+ static_assert(testConstexprSpan<3>(std::span<const int, 4>(iArr1, 4), iArr1 + 3), "");
+
+ static_assert(testConstexprSpan<0>(std::span<const int, 1>(iArr1 + 1, 1), iArr1 + 1), "");
+ static_assert(testConstexprSpan<1>(std::span<const int, 2>(iArr1 + 2, 2), iArr1 + 3), "");
+ static_assert(testConstexprSpan<2>(std::span<const int, 3>(iArr1 + 3, 3), iArr1 + 5), "");
+ static_assert(testConstexprSpan<3>(std::span<const int, 4>(iArr1 + 4, 4), iArr1 + 7), "");
+
+// static size
+ testRuntimeSpan<0>(std::span<int, 4>(iArr2, 4), iArr2);
+ testRuntimeSpan<1>(std::span<int, 4>(iArr2, 1), iArr2 + 1);
+ testRuntimeSpan<2>(std::span<int, 4>(iArr2, 2), iArr2 + 2);
+ testRuntimeSpan<3>(std::span<int, 4>(iArr2, 3), iArr2 + 3);
+
+ testRuntimeSpan<0>(std::span<int, 4>(iArr2 + 1, 1), iArr2 + 1);
+ testRuntimeSpan<1>(std::span<int, 4>(iArr2 + 2, 2), iArr2 + 3);
+ testRuntimeSpan<2>(std::span<int, 4>(iArr2 + 3, 3), iArr2 + 5);
+ testRuntimeSpan<3>(std::span<int, 4>(iArr2 + 4, 4), iArr2 + 7);
+
+
+ std::string s;
+ testRuntimeSpan<0>(std::span<std::string, 1>(&s, 1), &s);
+
+
+ return 0;
+}